ADU Design & Permitting in San Bernardino - One Fixed Price, Permits Handled

Fast, Reliable ADU Design & Permitting Across San Bernardino

ADU design and permitting in San Bernardino typically runs $8,500-$18,000 for the full drawings-to-permit package, with most projects clearing intake in 8-14 weeks once the mandatory electrical service upgrade is documented. We’re Nadia Ellery’s team at Ellery ADU Studio, coordinating design, permit sets, and build from our Inland Empire office with crews working San Bernardino neighborhoods directly. Call (951) 476-1467 to schedule your free estimate - every project gets a written price before any work starts, per Haven Standard Clause 1.

Call (951) 476-1467

San Bernardino’s flatland neighborhoods - from the Westside to the blocks ringing downtown - present a specific puzzle: oversized lots with rear-alley access, original 100-amp panels, and aging galvanized plumbing that the city’s building department won’t let past intake without upgrading first. We’ve handled that sequence on over 900 ADUs since 2015. We know which plans examiners flag fire-rated assembly details on party-wall conditions, and which Title 24 compliance paths actually pass for valley-floor climate zones hitting 108-115°F.

Why Ellery ADU Studio Rialto Is San Bernardino’s Preferred ADU Design & Permitting Company

Our reputation in San Bernardino rests on documentation, not promises. Every client receives a written price before work starts (Haven Standard, Clause 1), a documented photo record on every site visit, and a 365-Day Done Right Promise backed in writing. We don’t do callback queues - a live person answers calls 24/7.

San Bernardino homeowners have used our Free Second Opinion to catch scope gaps in competitor estimates, particularly on the electrical service upgrade that many flatland quotes omit entirely. Dispatch and scheduling run from our Inland Empire office, with crews serving San Bernardino locally. We’ve worked the alley-access lots near Base Line, the deep ranches north of the 210, and the foothill-adjacent parcels where Very High Fire Hazard Severity Zones trigger ember-resistant venting and ignition-resistant cladding requirements that coastal designers miss.

Our ADU Design & Permitting Services in San Bernardino

Site Assessment

Our San Bernardino site assessments start with the items that kill permit applications: verifying existing electrical service amperage, documenting galvanized versus copper supply lines, and measuring actual setbacks against the city’s GIS parcel data. On a recent Westside ranch, we found the original 100-amp panel and galvanized lines - both mandatory upgrades before the second-dwelling-unit application could even enter intake. We staged that job entirely off the rear alley to preserve driveway access, posted the party-wall notice to the adjacent lot line, and flagged the ignition-resistant cladding requirement early since the parcel sat near an elevated wind corridor. The assessment report includes photographed findings, a written scope, and a fixed-price quote - no “call for pricing.”

ADU Design & Blueprints

Our ADU Design & Permitting team produces permit-ready drawing sets calibrated to San Bernardino’s specific conditions: Title 24 energy compliance for Climate Zone 10 (extreme heat, Santa Ana wind loading), fire-rated assembly details where party-wall conditions exist with neighboring garages, and rear-alley staging plans that keep the driveway clear and neighbors informed. We specify James Hardie cladding and ember-resistant venting on foothill-adjacent parcels, and we design HVAC loads for 108-115°F summer peaks - not coastal 85°F assumptions that fail compliance. Every planset includes the electrical service upgrade documentation that San Bernardino’s building department requires before intake.

Permit Application

San Bernardino’s permit intake bounces applications that skip the 200-amp service upgrade documentation. We handle the full submittal: planset, Title 24 calculations, electrical load letter from the utility, and - where applicable - party-wall notices and fire-department clearance for Very High Fire Hazard Severity Zone parcels. We’ve learned which intake reviewers flag incomplete electrical documentation, and we front-load that verification so the 8-14 week timeline stays intact. Under Haven Standard Clause 5 (No Surprises), the scope is locked at signing; no door-side upsells, no scope creep once the application is live.

HOA & Zoning Compliance

San Bernardino’s by-right ADU allowances under state law override most HOA restrictions, but CC&R enforcement still requires documented compliance paths. We produce the zoning verification letter, the lot-coverage calculation (most 7,000-10,000 sq ft flatland lots clear easily), and the setback analysis that proves the project meets by-right standards. Where an HOA demands additional aesthetic review, we coordinate the submittal so it runs parallel to - not sequential to - the city permit track.

Title 24 Energy Compliance

San Bernardino’s valley-floor ADUs face Title 24 requirements stricter than coastal equivalents: higher insulation R-values, low-E glazing with specific SHGC ratings for solar heat gain, and HVAC sizing for 108-115°F design temperatures plus Santa Ana wind infiltration loads. Our energy consultants model each design in the compliance software that San Bernardino’s building department accepts, producing the CF-1R forms attached to every permit set. Failing to account for this climate load - specifying coastal-grade insulation and standard windows - is a common reason plansets return for revision.

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Trusted Brands We Service in San Bernardino

We specify and coordinate prefab and modular systems from Tuff Shed, James Hardie, and Abodu within the same single contract that covers your design and permitting - no designer-versus-builder blame gap if specifications don’t match field conditions. For San Bernardino’s fire-hazard parcels, James Hardie fiber-cement cladding meets ignition-resistant requirements without the maintenance cycle of wood alternatives. Tuff Shed’s engineered garage conversion shells integrate cleanly with our permit sets for the flatland’s detached two-car garages. Abodu’s units ship with pre-certified Title 24 packages that we verify against San Bernardino’s specific Climate Zone 10 requirements before submittal. Every brand selection is documented in the written scope, with no substitutions without client sign-off.

Common ADU Design & Permitting Problems We See in San Bernardino Homes

• The hidden 100-amp panel. That original mid-century panel sized for a single household? San Bernardino’s building department won’t accept a second-dwelling-unit application until it’s upgraded to 200-amp service with copper supply lines. We find this on roughly eight of ten flatland site assessments, and we quote it as a visible line item - never buried in “allowances.”
• Party-wall conditions on tight lots. When your detached garage sits within three feet of the neighbor’s structure, the city requires fire-rated assembly detailing and posted notice. We document this during site assessment, design the assembly into the planset, and handle the neighbor notification so intake doesn’t stall.
• Coastal-grade specs in a desert climate. Designers unfamiliar with San Bernardino’s 108-115°F peaks and Cajon Pass wind events specify light insulation and undersized HVAC that fails Title 24 or produces unrentable units. Our energy models use actual climate data, not default coastal assumptions.
• Foothill fire-hazard oversights. Parcels near the San Bernardino foothills fall in Very High Fire Hazard Severity Zones, requiring ember-resistant venting, ignition-resistant cladding, and specific eave detailing. Standard plansets skip these; ours include them from the first submittal.

Pricing for ADU Design & Permitting in San Bernardino, CA

We Also Serve Cities Near San Bernardino

Our crews work throughout the Inland Empire, including San Bernardino, Rialto, Redlands, Riverside, and Fontana. Each city’s building department has its own intake quirks - Riverside’s plan check timeline differs from San Bernardino’s, Redlands has specific historic-district overlay requirements - and we maintain current permit-track knowledge for each jurisdiction. The same single-contract, written-price model applies across every service area.

FAQs - ADU Design & Permitting in San Bernardino